Integrated fuel supply system for internal combustion engine

Abstract

An electronic fuel injection system is combined with a carburetor in a carbureted internal combustion engine. The resulting air/fuel induction system comprises a carburetor air/fuel induction system in combination with an electronic fuel injection system which uses the carburetor of the carburetor system as the air valve for the electronic fuel injection system. The carburetor system and the electronic fuel injection systems are interconnected, preferably so that the mixture cut-off of the carburetor system is employed to shut off fuel flow in the carburetor to the air stream for the induction manifold and to simultaneously turn on the electronic fuel injector system. Either manual or automatic interconnection can be employed in the present invention.

1. An air/fuel induction system for an internal combustion engine of an aircraft, the air/fuel induction system comprising a carbureted fuel induction system having an air valve and an electronic fuel injection system, both of which systems including a common intake manifold in fluid communication with said air valve of said carburetor, said system including a control connected to the mixture cut-off of the carburetor system which activates said electronic fuel injector system when moved to the mixture cut-off position. 
   
   
     2. The system of  claim 1 , wherein said electronic fuel injection system is retrofit onto a carbureted aircraft engine. 
   
   
     3. The system of  claim 2 , wherein said engine has a plurality of cylinders each having an intake port and said fuel injection system has at least one injector associated with each of said intake ports. 
   
   
     4. The system of  claim 2  wherein said fuel injector system comprises one or more fuel injectors which inject fuel into said common intake manifold. 
   
   
     5. The system of  claim 2  wherein said engine has 4 cylinders. 
   
   
     6. The system of  claim 2  wherein said engine has 6 cylinders. 
   
   
     7. The system of  claim 2  wherein said engine has 8 cylinders. 
   
   
     8. The system of  claim 2  wherein said engine is an air-cooled engine.